Hydraulics and Fluid Mechanics - Mechanical Engineering Questions and Answers

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The tendency of a liquid surface to contract is due to the following property

Cohesion

Adhesion

Viscosity

Surface tension

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The pressure measured with the help of a Piezometer tube is in

N/mm²

N/m²

Head of liquid

All of these

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A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to empty the tank completely will be

(2A√H₁)/(Cd × a√2g)

(2AH₁)/(Cd × a√2g)

(2AH₁3/2)/(Cd × a√2g)

(2AH₁²)/(Cd × a√2g)

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According to equation of continuity,

w1a1 = w2a2

w1v1 = w2v2

a1v1 = a2v2

a1/v1 = a2/v2

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The vapour pressure over the concave surface is

Less man the vapour pressure over the plane surface

Equal to the vapour pressure over the plane surface

Greater than the vapour pressure over the plane surface

Zero

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The equation of continuity holds good when the flow

Is steady

Is one dimensional

Velocity is uniform at all the cross sections

All of the above

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Pitot tube is used for measurement of

Pressure

Flow

Velocity

Discharge

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According to Chezy's formula, the discharge through an open channel is (where A = Area of flow, C = Chezy's constant, m = Hydraulic mean depth, and i = Uniform slope in bed)

A × √(m × i)

C × √(m × i)

AC × √(m × i)

mi × √(A × C)